You need to got into the render stats of the HDR dome and turn off visible in reflections and refractions.
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Look for 'mentalrayIbl1' in the outliner (unless you renamed it) and then go to the 'mentalrayIblShape1' node.
(I think I may of tried that before.. testing it now)
Ok if that doesn't work go to the rendering menu, lighting/shading, light linking editer, light-centric and diconnect the cookie jar geometry from 'mentalrayIbl1'
Alright I'll try that if it doesn't work this time
I think the first idea may have worked, I'm not sure why it didn't work the first time but I imported the file, turned off primary visibility (which seemed to have a result unlike last time) and visible in reflections and refractions.Thank you for the advice (FIngers crossed it stays fixed)